After an upgrade today, all kernels installed fail to boot my system, since they fail to load a firmware, probably for my USB hubs. Kernel 3.9 fails to boot at all, after the GRUB menu list, the screen turns black and that's it.

The boot process stops here, not matter whether enter re-enter the passphrase for my encrypted LVM. Before the error message I had already been asked for my passphrase, which was accepted: "logical volumes active", so that is not the problem. I can even open LVM via a live system.

Any tips on how to proceed from here? Re-installing the system and masking the kernel packages so they do not get upgraded. We are talking here about the minor revisions 3.14.x not major kernel versions.

Booting a live Gentoo CD and the manually compiling a kernel together with installing it in /boot and tinkering with it, so finally Sabayon boots a workable kernel?

This all looks like a lot of fun! I'm really pissed of, the system worked so well and now the kernel fails to boot!